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La ciencia observa english

on Dec 03, 2010

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Prsesentación sobre cómo la ciencia lee e interpreta el Universo

Prsesentación sobre cómo la ciencia lee e interpreta el Universo

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La ciencia observa englishPresentation Transcript

• Unit 1
• Science watches and measures the Universe
• What is the Universe?
• The Universe is everything existing
• Everything existing in the Universe only can be
• matter or energy
• What is matter?
• Matter is everything that takes up space and has mass
• What is energy?
• Energy is everything that can work
• What is Sciencie?
• Science is the knowledge based on observation, experimentation and logic reasoning.
• The scientific method is the way Science works: watching, measuring, predicting, checking...
• What is ”to measure”?
• T he properties of matter that can be measured are called magnitudes
• Ejemplos: length, volume, surface area,...
• Base Magnitudes define themselves. Example: length .
• Derived Magnitudes are defined from a combination of the base magnitudes. Example: speed.
• To measure is to compare a propertie of an object with a standard
• The unit of measurement is a reference or standard.
• Example: the metre .
• The measure instrument counts how many times are the standards in the object.
• Example: tape measure .
• The International System of Measurements
• Multiples and submultiples
• Derived units
• The derived units are obtained from a combination of the base units. They are used to measure surface area, volume, speed, density, etc. These units are the square metre, cubic metre, metre per second, etc.
• Properties of matter : Mass
• The mass is the amount of matter in a body.
• Weight
• Weight is the force generated by the gravitational attraction of the Earth on a body.
• Volume
• Volume is the amount of space occupied by an object.
• Surface Area
• The surface area is the space occupied by the length and width of a body.
• Density
• The density is the relationship between the mass and the volume of a body, that is, how concentrated the mass is in a specific volume.
d = m/v
• What is matter made off?
• All matter is made up of atoms .
• An atom is the smallest particle of matter which can exist alone.
• The structure of an atom
• Proton
• Electron
• Neutron
• Quarks
• How are atoms organised?
• Molécules : are made up of two or more atoms.
• Crystals : consist of atoms or molecules arranged in a regular, organised structure.
• Elements in the Universe
• All atoms in the Universe are made up of the same particles, the only difference is the number of particles.
• The number of protons in the nucleos of an atom is the atomic number.
• Chemical Element is a substance that contains one type of atom, so all atoms have the same atomic number .
• How are elements classified?
• Elements and compound substances
• Chemical Element is a substance that contains one type of atom. It cannot be broken down into anything simpler by chemical reaction..
• The combination of elements produce millions of compound substances .
• Each element has its own chemical symbol. To describe molecules a chemical formula is used.